There are two battery feeds to the radio
1...The main one that connects the battery supply via the Ignition Switch
2...A permanently connected battery that maintains the Code Memory and Tuning Settings Memory.
It looks as though the (2 ) is missing
Usual problem is a blown fuse or loose connector at rear of radio.
Can be tested using a Multi-Meter or Test Lamp
CLICK HERE for useful website with the connector pin diagrams
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